Lifting-jack.



W. CLEMENS.

LIFTING JACK.

APPLICATION FILED 1AN.5.1919.

1,298,895. f I Patented Apr.`1,1919.

INVEN TOR.

MLM/f Cifra-Ns- WILLIAM *('ili'flilVlENSa 0F SAN FERNANDO, CALIFORNIA.

LIFTING- JACK.

Specification of Letters Patent.

Patented Apr. 1, 1919.. l

Application led January 6, 1919. Serial No. 269,861.

To all whom t may concern.'

Be it known that I, WILLIAM CLnMENs, a citizen of the United States,residing at San Fernando, in the county of Los Angeles and State ofCalifornia, have invented new and useful Improvements in Lifting-Jacks,of which the following is a specification.

My invention relates to lifting jacks and more particularly toa liftingjack adapted to be suspended from' a derrick or overhead beam. 4

An object of my invention is to provide a lifting jack suitable forlifting objects which are normally at some distance from the ground,such as wagon beds and the like.

With this and other objects in view, my invention consists intheconstruction, combination and arrangement of vparts lherein shown,.described and claimed. Y

In the accompanying drawings, which form a part of this specication,

Figure 1 is a side elevation showing a lifting jack embodying theprinciples of my invention suspended to an over-head beam, parts beingbroken away toshow theN c onstruction. f

Fig. 2 is an enlargedsectional detail on the line 2-2 of 1.

Fig. 3 is an enlarged sectional detail on the line 3-3 of Fig. 1 showingthe vconnec- V tions of the links with the lever and showing the springwhich acts to hold the catch pins against the rack bar.

Fig. 4 is a fragmentary edge view looking in the direction indicated bythe arrow 4 in Fig. 1.

Fig. 5 is a view analogous to Fig. 1 and' showing a different operation.

Referring to the drawings in detail, a supporting frame 1 has a hook 2attached. to its upper end and the hook 2 is suspended from a beam 3 bya cable 4. The supporting frame 1"is made up of a wide middle bar 5which serves as a rack bar and the outer guide bars 6 and 7 there beingspaces 8 and v9 between the guide bars and the rack bar.

The rack bar 5 has a series of rounded and upwardly turned notches ineach of its sides 10 and 11, said notches being staggered with referenceto each other, so that a notch on one side is midway between two notcheson the opposite side. A link 12 is formed of parallel bars 13 and 14,the lower ends of lthe bars being connected to a hand lever bar 15 by apivot bolt 16. The upper ends of the link bars are connected by a catchpin 17 which holds the bars spaced apart, so that the catch pin 17 willengage in the notches 11, and so that the bars 13 and 14 will workfreely in opposite sides of therack bar 5. A similar link 18 consists oftwo bars connected to the hand lever bar 15 by a bolt 19 with a catchpin 20 at itsupper end to engage in the notches 10. A' retractile coilspring 21 has its ends attached to the links l2 and 18 a short distanceabove the hand lever bar. 15 by bolts 22 and 1 23,'the tensionAdownwardly out ofthe notches 10 andl 11.

A hook 24 is pivotally connected to the hand lever bar 15 half waybetween the bolts 19 and 16, and the'hook 24 is adapted to carry theload to be lifted. The ends 25 and 26 of the hand lever bar 15 areround, so that pipe extensions may be slipped over the ends 25 and 26and used as operating handles. A throw-oil' lever- 27 is connected ltothe bar 13 by a capI screw pivot 28 extending looselly in theintermediate portion of the lever.` handle 29l extends outwardly fromthelong end of the lever 27, and a tongue 30 extends inwardly from theshort end of the lever. The lever is bent in sideelevation so that thelong end 31 hangs downwardly from the pivot 28, and the short end 32extends upwardly and laterally from the' pivot nearly at a right angle.The tongue 30 of the throw-oli' lever 27 engages the inner edge of oneof the bars of the link 18. An'operating cord 33 is connected to thehandle 29. When the cord 33 is released the long end 31 of the throw-offlever 27 will hang downw-ardly and swing freely upon the pivot 28.

The jack thus constructed may be operated from either end of the handlever bar 15 or from both ends simultaneously, and as the hand lever baris vibratedup and down the links 12 and 18 will alternately raise andlower, and the catch pins 17 and 20 will alternately carry the load,andthe load will be raised or lowered stepbystep.

Assuming that the hand lever 15 is being operated from the .right-handend, as shown in F ig. 1, the pipe extension is slipped over the roundend 26, and the pipe extension is omitted from the other end. Upwardmove- ,ment of the handle will bring the link 18 into position with Athecatch pin 20 in the notch 10, and the catchpin will support .the Y loadwhile the link 12 moves upwardly until `the catch pien .117 moves vintothe next notch 11. Duringthisoperation the `pivot bolt 19 isfthefulcrumofthehand lever 15. Down- .ward movement of the handle will thenfv.throw .the load upon the catch pin 17 and Athepivoti'bolt -l'becomesthe fulcrum .of the hand :lever 115. This action will cause the link .18.fto move upwardly until vthe catch ,pinQOengages .the next .highernotch and so -on`. Thus by alternately xraising andlowerringthe.handleand vibrating the hand lever :15 the-catch pins 17and .QOalternately moveV ferate Vthe throw-off lever 27 to push the-tongue 30 against .the :link 18, thereby mov-V ing .thelink vv18 tomove the catch pin V20 into the .space 8 Aclear `of the rack bar; thenthe .handle will :be operatedY to lower. the catch .pin2`0 to the .next.notch below, and the cord 3-3 released, then ithe; operation of thehandle l-wilvlbecontinued xto throwtheload upon the ,catch ,pin20,;.thenthefcord .33 will be pulled .ato throw the catch Apin 17 .outofthe .notch .and .therhandle vwill-be :operated =to lower the Ycatch.pin 1:7 :to :the next notch asshown in VF-ig.' 5 :and :this `operationis continued to lower the 'load step zby step.

Variousfchanges may be made without departing fnomthe spirit of myinvention as claimed.

.Iclaims l. .A li-tting jack comprising, a rsuspended l .suppor-tingbar,said supporting bar consist- 'ingsof .la .middle two edged rack :bar andtwo parallel guide 'bars in spaced relation to the :edges of the .rackbar; Va .catch .acting .along :and in engagement with each of .the Atwo.notched edgesaof .said rack bar between said .guide .bars andssa'idrack fbar; a r'lever adapt- .ed to be operated at either end; :linksop'er- .ativelylconnecting said catches to said lever bart;V meansfforvsuspending .said .supporting bar; and .means 'for attaching the load tosaid leverbar.

` .52. A lifting'jackcomprising, .a suspended supportin'gbar :consistingof a middle two edged rack bar and two vparallel guide bars in spacedrelation to the edges of said rack bar; catch. pins acting along theedges and in engagement with the notches in said rack bar.; a lever .baradapted to be operated at either end; links in the ulpper ends of whichsaidcatch pins are iixed and the lower ends of which are pivoted to saidlever bar in spaced relation to each other.; a retractile spring havingone end fixed to each of said Ylin-ks and `.adapted to pull said catchpins fixed in the upper ends of said link into the notches in saidprackbar; means forsuspending .said supporting bar; and .means forattachingthe load .to said lever bar.

.3. .A lifting Ajack comprising, asuspended supporting bar, saidsupporting bar consist+ ing of a middletwo edged rackbar andtwo parallelguide bars in spaced relation tothe edges of the rack bar; acatch4acting .alon land in .engagement with each of the two to saidlever-bar; .and athrow-o' lever pivotally `connected to one link andadaptedto .engage the other llink.

4. A lifting jack comprising, asuspended `notched,edges-ofsaid yrack barAloetween said supporting bar .consisting 'of a middle two edged rackbar andftwo .parallel guide bars in spaced .relation to theedgesof .saidrack bar; catch vpinsacting along the edges .and in engagement with the:notches in said-.rack bar; a lever bar adapted'to be .operated ateither end; links in the upper ends .of which saidcatch pins .are fixed.andthe lower ends of which are pivoted lto said lever l:bar `in Yspacedrelation :to veach other; a retractile spring having one endiixedto each ofsaid links and adapted Yto .pull :said catch pins fixed in theupperends of saidlinkinto @the notches in said rack bar; meansyfoi-:suspending .said 'supporting bar; means for attaching the load tosaid lever .bargnand a'throwoff lever pivotally connected toone'flink-and adapted to .engagetheother link to hold one catch pin outoengagement whilethe .other is in engagement. j

y5. A `lifting jack comprising, a suspended vsupporting bar, said4supporting bar .consistingfof amiddle two edged rack .bar and twovparallel guidebars .in .spaced relation to the .edges .of the rack`loar; a catch :acting along `:and in engagement Ywith vveach of thetwo.

notched ,edges .of said .ra-ck bar between said guide bars and said rackbar; .a .lever bar; links operatively '.connectingsaid catches to saidlever bari; means for suspending .said

, supporting .bar and ,means for attaching the load to said lever bar. I

.6. .A ilifting jack comprisingasuspended' supporting bar, saidsupporting bar consistsaid lever bar; means for suspending said ing of amiddle two edged rack bar and twO supporting bar; means for attachingthe 10 parallel guide bars in spaced relation to the load to said leverbar; and means for operedges of the rack bar; a catch acting along atingthe catches to step the load down- 5 and in engagement with each of thetwo wardly.

notched edges of said rack bar between said In testimony whereof I havesigned my guide bars and said rack bar; a lever bar; name to thisspecification. v links-operatively connecting said catches to WILLIAMCLEMENS.

Copies of this 'patent may be obtained for ve cents each, by addressingthe Commissioner of Patents, Washington, D. C.

